Manufacture of paper board



Oct. 4, 1932. w. cAsE ET AL MANUFAC'EURE OF PAPER BOARD Filed April 24. 1931 Patented Oct. 4, 1932 UNITED sr rEs PATENT OFFLCE LAWRENCE w. cAsE, or HIGHLAND PARK, Ann HAROLD E. cone. or son'rn MAN; CHESTER, 'GONNEGTIGUI, ASSIGNGES', r oAsn BROTHERS, 1 0- O N ESTER. connnerrour; AND oesnsa. MARSHALL, me, or EAsrnAR'rronn connnoriou'r nAn'urAoruBn on PAIBER BOARD Application. file AP i This invention relates to the, manufacture of thick, heavy board from sheetsor webs of fibrous material, as paper, whichproduct is; used for electrical insulation and other purposes where a tough, dense .and hard board is required. V i The object of he invention is to so construot a machine, which may be of the type illustrated in. United States Patent No. 1,186,881., June 13, 1916, that the fibers of the separate webs orsheets which have had a surface or surfaces coatedwith adhesive and are designed to be united by pressure,

as by calendering or pressure cylinders, will.

be ydrated to such an extentthat the board produced when subsequently calender-ed or glazed will have practically the same density throughout and he as .hardand tough inthe interior. as on the surfaces; r I In the machine illustratedseveral sheets or webs, of strong paper, that have had one or,both surfaces coated with adhesive, are

fed from individual rolls about suitable bars and then upward tothe nip of a pair'of calendering orpressure cylinders. WVhile the sheets Qa-re passing upward to the cylinders one or both surfaces aresho-weredwith asufficient quantityof water to moisten the fibers to the degree required to render'the adhesive adheresc'ent and to insure the necessaryhydration of the stock under the pressure of the cylinders. V i

The ainount of water that is allowed to be absorbed is determined bythe quality of the stock, the amount of sizein the stock,

and the density required inthe finished board, and this quantity of water is regulated by adjustable gates arranged adjacent to the surfacesof the upwardly moving sheets beyond the localities where they"have been showered and in such positions as will prevent the surplus water from being carried up by the sheets beyond the necessary predetermined distances. Thus treated the separate sheets unite intimately, with the fibers in the interior somoistened that further wetting ofthe sheets before being subsequently .calendered'or glazed is obviated and the interior of the board will be uniformly hydrated;

1921. Serial no. 532,428.

Fig. l of the accompanying drawingindi cates a side elevation of such features of a machine of the character mentioned as will enable this inventionto be practiced. Fig. 2 isa'detail view on larger scale illustrating the relationsof' the pressure cylinders, pipes for showering the sheets with water as they pass upwardto the nip of the cylinders, and the gates which control the height that the free Watercan'travel up with the separate sheets. "Fig. 3 isa- "detail view of the gates and gate supporting means. Fig. 4 is a detail plan of thevgate supporting means.

The machine illustrated has an upright frame 1 shown as: supporting six rolls ofp aper 2. The invention, h'owevenis not limited'to this particular number of rolls of paper. These rolls of'pape'r are carried by shafts 3 whichare held in bearings 4 attached tothe frame. The shafts are shown as having-pith leys 5 providedwith brakes 6', the tension of which can be regulated so that the rolls will unwind uniformly. The paper webs are drawn from the rolls around friction bars? that extend across-the frames, and over and under tiers of friction bars 8 and 9. From the'latter bars the'webs are drawn together and superposed between calendering or'pressure cylinders lO which are supported by bear} ings ll mounted in a frame 12. The upper cylinder bearings are provided with means, such as screws 13, for imparting the requisite pressure, which is considerable, to the webs as theypassbetween the cylinders, The shaft of the lower cylinder'has a gear 145 with which meshes a pinion 15 on a shaft provided with a driving pulley 16. The webs after passing between and being united by the press cylinders may pass between rolls 1,7 and then be out into sheets or wound into a roll upon an arbor 18 that has a gear, 19 which isengaged by a pinion 20 on a shaft provided with a driving pulley 21. T

The vertically, arranged friction bars 9 and the cylinders 10 are so relativelypositioned holes or slots from which water may be showered onto the surfaces of the webs. These pipes are connected at one end with an intake header 23 and at the other end with an outflow header 24, valves 25 being provided whereby the fiow of water from any of the shower pipes may be regulated or shut off from the supply. The intake header is designed to be connected with a suitable source of water and the shower pipes are 50 arranged that the holes or slots will'spray water upon the sheets at approximately their lowest points, or where they leave the bars 9 and start on their upward travel to the cylinders 10.

Extending horizontally between and across the webs and adjustable on the same incline as the incline of the webs aregates 26. In the embodiment illustrated the gates are in the form of rolls or spindles 27 that are carried by blocks 28 which. are movably mounted on rods 29. These rods are shown as supported by the machine. frames land 12, on the same inclination as the, sheets of paper to which the gates are respectively applied.

' The gates are arranged to control the amount of water that will be absorbed by the webs, and they are adjusted according to the character of the stock, the quantity of size in the stock and the amountzof'hydration that is desired. The adjustment of the gates determines the time that the free water will remain in contact with the upwardly moving surfaces of the webs and consequently the amount of water that will permeate and will hydrate thestock in the. interior-of the finished board. When the. fibers of each. of the webs are thus moistened a desired precentage of moisture remains in the interior webs after they are united and pressed by the cylinders and the stock becomes sohydrated throughout that when subsequently calendered or glazed by cylinders or ironsthe interior of the fin ished board will not be spongy but will be hard and of a densitysubstantiallyequal to that of the exterior surfaces.

It is well, understood in the paper making 7 art that pressure applied to the surface of paper, or like fibrous material, in the presence of water gives a hydrating effect. On thin paper this eflect will extend through the sheet, but on thick paper or boards,this effect is .limitedto the surfaces. By the employment of the present invention a product is produced which is hydrated through the entire structure.

The invention claimed is:

1. The combination in a machine for forming board ofa plurality of plies of adhesive coated fibrous material, of friction bars, pres sure cylinders for pressing the plies together, said bars and cylinders being so related that the sheets travel upwardly from the former to the latter, means for showering the upwardly traveling plies between the bars and cylinders, with water and rolls adjustably' mounted between said bars and cylinders for limiting the amount of free water carried upward by the traveling sheets.

7 2. .The combination in a machine for formsaid bars and cylinders beingso related that" the plies travel on anincline'from the former tothe latter, means for showering the up wardly traveling sheets between the bars and cylinders, with water, and gates applied to the sheets intermediate the bars and cylinders for controlling the amount of free water carried upward by the traveling sheets.

. 3. The combination in a machine for forming board of a plurality of sheets of paper,

of friction bars for the individual sheets,

pressure cylinders for uniting the sheets, said bars and'cylinders being so related that the sheets travel on an incline from the former to the latter, means for showering the upwardly traveling sheets between thebars and cylinders, with water and rolls bearing on the moistened sheets between thebars and cylinders. V

. 4. The combination in a machine for forming board of a plurality of sheets of paper,

of friction bars for the individual sheets, pressure cylinders for uniting the sheets, said bars and cylinders being so related that the sheets travel from the former to the latter, means for showering thetraveling sheetsbetween the bars and the cylinders with water, and gates applied to the sheets intermediate the bars and cylinders for controlling the amount of water carried by the traveling sheets. I

5.. The combinationin a machine for form, ing boardv of a plurality of sheets of paper, of friction bars for. the individual sheets, pressure cylinders for uniting the sheets, said bars andcylinders being so related thatthe sheets travel on an incline from the former to the latter, means for moistening the upwardly traveling sheets between the bars and the cylinders, with water, gates applied to the sheets intermediate the bars and cylinders, and means for adjusting said gates parallel with the inclined travel of the respe cshowering the sheets of paper with water,

and rolls in contact wti'h the moistened sheets intermediate the said pipes and the cylinders.

7 The combination in a machine for forming board of a plurality of sheets of paper, of

fixed parallel friction bars for the individual sheets, rotatable cylinders for uniting the sheets, said bars and cylinders being parallel and so related that the sheets travel upwardly from the former to the latter, pipes located between the bars and cylinders for Inoistening the sheets of paper with water, rolls in contact with the moistened sheets intermediate the said pipes and cylinders, and means for adjusting said rolls parallel with the travel of the respective sheets.

LAWRENCE W. CASE. HAROLD E. CUDE. 

